Epilobium ciliatum subsp. watsonii

San Francisco willowherb

Family:Onagraceae

Rarity

CNPS-EB: A1

2 current natural populations

Criteria:

Limited/Threatened Habitat
Small Populations

Observations

Key

Ecology

Flowers May - October

Habitats:

Freshwater Marsh
Riparian

All Epilobium

E. campestre (C)
E. ciliatum subsp. watsonii
E. cleistogamum (A1)
E. torreyi (A2)

References

Synonyms

Epilobium watsonii
Epilobium watsonii var. franciscanum

Populations

Key

Location	Pop ID	Last Recorded	Notes
Cull Canyon Rgnl Park	4	2006-10-09
Lily Spring, San Pablo Ridge - EBMUD land	7	2025-06-08
Berkeley - other or unknown sites	1	1965-12-31	Historic
Browns Island	2	1991-08-18	Historic
Chabot Rgnl Park	3	1993-12-31	Historic
Dry Creek Pioneer Rgnl Park	5	1993-07-13	Historic
EBMUD land on San Pablo Ridge	8	1993-12-31	Historic
Lafayette Reservoir - EBMUD	6	1991-09-22	Historic
Leona Heights Rgnl Park, or nearby	11	1998-06-01	Historic
Pt. Pinole Rgnl Park	13	1993-05-05	Historic
San Pablo Reservoir - EBMUD	10	1991-09-28	Historic
Sunol Rgnl Wilderness	14	1993-08-06	Historic
Tilden Rgnl Park - other or unknown sites	9	1997-12-31	Historic
UC Campus, Berkeley	15	1957-06-19	Historic
Wildcat Canyon Area	12	1937-12-31	Historic

The list of populations shows the distinct populations identified by the CNPS-EB Rare and Unusual Plants Committee. The locations in this list are very general. More specific location details can be obtained from the links in the Observations section (for some of these links, a login is required).

Font

Populations in bold type have precise coordinates available for field volunteers and researchers.

Populations in normal type are only known from a description of the location; no precise coordinates are available.

Background

Populations with a white background have been observed in the last 25 years.

Populations with a blue background have not been observed for at least 25 years.

Populations with an orange background have an uncertain location or identification, or are planted.

Columns

Pop ID is a label that identifies the population. Many locations have more than one population of a species, and the population ID is used to distinguish them.